Electric Circuits
Two resistors R1 and R2 give combined resistance of 4.5 Ohm when connected in series and 1 Ohm when in parallel, the resistances are

 1.5 Ohm and 3 Ohm.
 1.25 Ohm and 3.25 Ohm.
 2.2 Ohm and 2.3 Ohm.
 2 Ohm and 2.5 Ohm.

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